build-projects-xcode & isfileselected

There seems to be some sort of problem with the "build-projects-xcode"  
target:

When I try to build, I get this error:

/Users/rawtest/Desktop/apache/apache-log4cxx-0.10.0/build.xml:1049:  
The following error occurred while executing this line:
/Users/rawtest/Desktop/apache/apache-log4cxx-0.10.0/build.xml:973: The  
following error occurred while executing this line:
/Users/rawtest/Desktop/apache/apache-log4cxx-0.10.0/src/ant/find- 
apr.xml:248: Class org.apache.tools.ant.taskdefs.condition.And doesn't  
support the nested "isfileselected" element.

I have ant 1.6.2 on Darwin 8.11.0 trying to build log4cxx 0.10.0.

(Same problem with src/ant/find-apr-util.xml at line 248). I can work  
around that by removing the "isfileselected" element.

/Daniel